我Google了一下，区别如下。但是我个人认为区别不大哈

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1. Origins：

2. South Seas pearls are farmed from the Indian and Pacific oceans and are produced by two kinds of mollusks: the silver lipped and gold lipped Pinctada Maxima pearl oyster. Tahitian pearls are harvested off the coasts of Tahiti and French Polynesia, and are created only by the Pinctada Margaritifera oyster.

   Colors

   • Jewelry aficionados prize South Seas pearls for their delicate pastel hues, which range from soft white to creamy pink and champagne. At the opposite end of the spectrum, Tahitian pearls are bold and dramatic. While true "black" pearls are some of the rarest in the world, Tahitian pearls are typically dark gray with undertones of green and dark blue. Lighter Tahitian pearls have a silver sheen.

   Size

   • Both South Seas and Tahitian pearls can be found in larger than average sizes, but South Seas pearls are slightly larger than Tahitian pearls. The average South Seas pearl is 15 mm in size, while a Tahitian pearl is usually 13 mm in size.

   Nacre Thickness

   • Nacre is the calcium secreted by an oyster that covers the shell nucleus, and which forms the base of the pearl. South Seas pearls develop a thicker nacre coating than any other kind of pearl, usually ranging from 2 mm to 6 mm. Tahitian pearls have a nacre thickness of 2 mm to 3 mm. It is this thick nacre coat that accounts for the richness of the South Seas pearl's luster.